Add mean operator to tflite int8 quantization test.

PiperOrigin-RevId: 277362640
Change-Id: I291a20210d7ce86603f95dce9c1feaf64e9aee0d

tensorflow/lite/testing/BUILD

@@ -491,6 +491,7 @@ edgetpu_ops = [
     "fully_connected",
     "l2norm",  # high error
     "max_pool",
+    "mean",
     "mul",
     "pad",  # high error
     "relu6",

tensorflow/lite/testing/op_tests/reduce.py

@@ -169,7 +169,13 @@ def make_reduce_tests(reduce_op,
 @register_make_test_function()
 def make_mean_tests(options):
   """Make a set of tests to do mean."""
-  return make_reduce_tests(tf.reduce_mean)(options)
+  return make_reduce_tests(
+      tf.reduce_mean,
+      min_value=-1,
+      max_value=1,
+      boolean_tensor_only=False,
+      allow_fully_quantize=True)(
+          options)
 
 
 @register_make_test_function()